Guard strip



Sept. 18, 11934. J J BANAS 1,974,325

GUARD SERIP 7 Filed Aug. 14, 19:55 2 Sheets-Sheet '1 INVENTOR v ATTORNEY J-. J. BANAS GUARD STRIP Sept. 1 8, 193.4.

2 Sheets-Sheet 2 Filed Aug. 14, 1935 Jose h Jfianas INVENTOR BY 4% 915M144,

ATTO R N EY Patented Sept. 18, 1934 EB S TE PATENT FFICE 3 Claims.

This invention relates to paper-making and has for its object the provision of means whereby a guard strip may, be impressed upon a sheet of paper as it is formed and serve to limit the effects of a break in the forming web and also serve as a guide in trimming the edge of the web or sheet.

The invention is illustrated in the accompanying drawings and will be hereinafter fully described and particularly defined in the appended claims.

In the drawings:

Figures 1 and 1a together constitute a side elevation of so much of a Fourdrinier machine as is necessary for an understanding of the present invention.

Figures 2 and 2a together constitute a top plan view of the Fourdrinier machine.

Figure 3 is an enlarged side elevation of a series of guide rollers and a reel for supporting the guard strip of the present invention and guiding it onto the forming web of paper.

Figure 4 is a front elevation of the same.

Figure 5 is a plan View of a web or sheet of paper in the formative stage showing how a break may occur in the material.

Figure 6 is a similar view showing the application of the guard strip to limit the effects of the break.

Figure 7 is a detail plan View of a portion of the guard strip.

lhe Fourdrinier machine is not changed in construction or the arrangement of its parts in order to practice the present invention but some additional parts are used in connection therewith. It is therefore deemed unnecessary to describe the Fourdrinier machine inasmuch as its construction and operation are well known to those skilled in the art. In carrying out the present invention, a reel 1 is mounted above the machine adjacent the ends of the deckle straps indicated at 2 and a series of rollers 3 are arranged below the reel 1, the lowest roller 3 being of such length that it will extend across the entire width of the travelling pulp and will press the guard strip onto the same. The pulp is indicated at 4 and is travelling upon an endless wire cloth 5 which constitutes a part of the Fourdrinier machine as will be understood, the parts being so arranged that the pressing roller 3 will meet the web or pulp just after it passes the suction box indicated at 6. The guard strip 7 is composed of any preferred fibrous material and consists of fine threads disposed in intersecting relation diagonally of the length of the strip with open spaces between adjacent threads, the threads being provided in about 40 to an inch. The rollers 3 are mounted upon rotating shafts, upon each of which is secured a pulley 8 and a driving cable 9 is trained about the pulleys as shown in Figures 3 and 4. As the web is drawn forward through the action of the Fourdrinier machine the guard strips disposed one at each side of the web will be impressed upon the web by the lowest roller 3 and will partake of the travel of the web so as to pass with it through the several elements of the machine. When the web and the guard strips emerge from the calender, indicated at 10, they will be carried to the winding reel 11 upon which the sheet is wound, and cutter disks 12 mounted above said reel will trim the edges of the web just inside the guard strips, the trimmed paper sheet or web being wound on the reel 11, while the guard strips will pass beyond said reel and will be wound upon a reel 13 suitably mounted and driven adjacent the end of the machine, as will be understood by reference to Figure 1a. The guard strips winding upon the reel 13 may be cut into any desired length and may be treated to be relieved of the pulp which has been absorbed and then transferred to the position occupied by the reel 1 for use in connection with another paper web or sheet.

A difficulty encountered by paper manufacturers is breaking or tearing of the web as it passes through the Fourdrinier machine and in Figures 5 and 6 the web indicated by the numeral 14 is shown as having a break or weak spot 15 produced therein. This weak spot may be due to various causes, as water or slime falling upon it or from the presence of a weak spot from any reason. This break may be spread along the lines indicated at 16 and will be stopped adjacent the edges of the sheet by the guard strips. The break may, however, extend longitudinally of the web or sheet along the line 17 and this break may be stopped by placing a section 18 of the guard strip transversely of the web as shown in Figure 6. The transverse strip 18 will be cut from the guard strips which are not in use and will be kept in readiness for use when needed. When the attendants notice a break in the web, this section of the strip will be applied to the dandy roll which will place it in position upon the web so that the loss due to the breakage will be minimized. When a break in the web or sheet occurs the machine is not stopped, because the result of the stoppage will be the piling up of the web at the back of the break and loss of material and time in clearing up the stoppage. These disadvantages are all overcome by the use of my guard strip which is inexpensive and may be applied to the forming web Without any alteration in the Fourdrinier machine and Without adding materially to the cost of operation.

Having thus described the invention what is claimed is:

l. The combination with a Fourdrinier machine, of a reel and a presser roller arranged adjacent the suction box and deckle straps of the machine, reels disposed adjacent the delivery end of the machine, and cutter disks operating in advance of the reels whereby guard strips mounted upon the first mentioned reels may be impressed upon the web of pulp traveling through the machine and guide the cutters to trim the edges of the sheet into which the pulp is converted.

2. Means for limiting breaks in paper pulp webs, comprising guard strips of fibrous material disposed along the edges of the web whereby to stop breaks occurring transversely of the web.

3. Means for limiting breaks in paper pulp webs, consisting of guard strips disposed along the edges of the web, and. a transverse section of guard strip disposed upon the Web across the line of 'a forming break.

JOSEPH JOHN BANAS.

Lilo 

